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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11748aee3114b9ee987cab1fb980eaa9917a68e15eb29af885b6c8c541e6db38' 
  AND token = 'lZ0Yserau7R8Ook2YWjzzQQm3felHzPWNjTH+MV4bVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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