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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a89d398d25929a7b0d26ab4c81d333eab34910f1d1fe35ce35a31b2408c0cab' 
  AND token = 'kleqZ0brwhRJLa3riS7/cpOzV1+GsC1ttfOeuyHl5pI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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