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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '738d24a0a0f68f5003689057b6b54b00f28510b072daa78e00a37fb80d4c0563' 
  AND token = '9Um46fw66Sc9ZYVdbOeqN7bwHVshiZbPcTT4N3DJ6fI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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