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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e73b2510b1b6c9081d3c6f27d0bdfbd0517aa19f4d90b72eeeb1fc33203a62da' 
  AND token = 'Z1kmfdY0mYsEPx7PWpKO5PxFWM2AdruxRo9h56tzk4A=' 
  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"
    }
  }
}