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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7014f90591103fb015acd05b65cbfb6e128a6130b96b5974e89edd426096ac76' 
  AND token = 'hZG9+01i7woXzQGULkj9WejtT1Qdn7dCXIqnrc1sWYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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