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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e36bb3b7e9b2b10f9e02a429d44a38b13c2ca5d0dec6d90f06c470735024e52f' 
  AND token = 'J4y9V7ieKgVITDed9z5BKWQuexuEiuN1iqT890eIBsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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