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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c6d2bf02d202ae603893594b687475520c99ddaaeeed8e54f29cbad4e8904bc' 
  AND token = 'Ne7oEd7ozW6TweFQJ0pSudUHh4/PfWhN/jYH77XhOoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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