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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd56eb082a11c334ccb680a523ee54c9931a888b040d5da39805a39aaffa54c00' 
  AND token = 'tK+OyDOqU7QlrkRWw5U3hrxEp3KmJxfXWFFiFSXt4zI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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