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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b46feab16e84ff2cda8e841903a70f9a99b78604247d69932e91fd4a6c263e26' 
  AND token = 'S5cKKXG1FUo60MySa/cb6sATgLwfB6HThu+hfIrBiLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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