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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b670eaf854392a63832c59afc057dc7d8a85bc19ccc48271f470e4c8a1b745e2' 
  AND token = 'IaZ6xOq2xodxdPxOWoi4RsLNNzmm0u/gRh5j2IRW1Hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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