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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '128c6a856614ac732f3f136e8a79f8b499ab4f70bac752f8e888471ed6f45538' 
  AND token = 'FFU94G4ayPTlbSaiXY8m/FK4Ch18xzl6UtpxWnqTdVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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