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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9a7aca1d8001ee2db72e5fd4f01560c9d13e0cf600dbd848245d593c86b5045' 
  AND token = 'c0MGAbLO3y10LmEp8H/ih29oBK3IpCdpuue2O4tYdsg=' 
  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"
    }
  }
}