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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a41a2a3297e7b6731b132b8950ea1e0efd06ca77b2130a843eda0a0f888e8fd' 
  AND token = 'Zq3VJtpRxrRe7cLokUcqFVEV2P618c1rZpPS3AMU7dY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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