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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '709e755498bd7a7e37a6be7e72d54c12b20e3b59264bcf444fb21a2d514a14c7' 
  AND token = 'p/WDbUbydWGw155kjjFRUZZP9zC6n8DRZfIGDCb4iHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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