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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c628b54fc9fd0085b0158b255a22800c0a9515de5e842568c840a5312ff38226' 
  AND token = 'hvl5e7q42nWz4NGQ+TU0PwG+DL/iJxJu37lpEddJV18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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