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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dac33e1fa7a4dbd6e2dc654aaf3ae8cde29892ff29052ebd5fa17f6ee5dd6dce' 
  AND token = 'i7NVF5vJJvU8xE5an+5L1r2xbeYsUYonYLLLbtaQ8BI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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