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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ebb36ae421d45818b438e8c362a9ce8d32878535216440f4e4f77a4b50066a3' 
  AND token = 'U2Z7L0NYIo2aIbSk836krcxEFyxXT9mM/TwIJJi+XBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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