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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd459ed30d0c8de0b76dd1fcfa9b88cbd77c50cd5f3fccf8ac3d3a598293454b' 
  AND token = 'L51G55KT02RaVwkoQ7hucLjIaX7/aMC/EDOsLFeleXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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