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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cc4051608c6296fbed6f93ec40e29b79e8a2e1d1faed31e2cd18c627fe406d6' 
  AND token = 'MYbTGybqMsiVd2XCqZChIZGvIVFd5C4jp7vSkfywklQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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