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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f169dd157f3cddc7ac49ed26c71363af2937311cb873543e3b4cd7c52178bc1d' 
  AND token = 'riYwKt0ijYWwF0hXzcWln+10jm4fPuChfPZ9buCFfY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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