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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59bf675ecb7319d0042f15a7ffd9f2b5e443d51e6b418d085fc7d1bb8c2de59a' 
  AND token = '/RNDeCiHZ2WYs151VDLqFX5eg/ZoOFd76ij8ukjtuBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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