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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73f6ffd8862f04c0682e928c1f5adb6ec10105bfa04f2ab6747f75a27aa05f74' 
  AND token = 'a8UBPy1DamgNnTUy0o4JpwjU2ISKsR5JMdWEtsFHJ3c=' 
  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"
    }
  }
}