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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccdb89bd96d989656a222a72c3ac04169c82334308a7837c85e6a3c776b3ff28' 
  AND token = 'fldP9jDqzUY3rErvkEH5t0TJ7m0SC3iu/wWKt/uDo6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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