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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bea3a77c5f7fe143a3a6f291371ee120668143db1f6c703847e28c04b38b9cf4' 
  AND token = 'rbltVQaaGIxxJ0BeNIetDZj3T9f0z/Cch9Kee2Cf1xI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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