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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4dbd746c3effee54187887ac49334699deb781716afc56c29e6f904ff2426be' 
  AND token = '4u4pQ6fiozntCW5KOTWs9OPDaVYNVJdvI2lvDUl6zl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}