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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db4b3d885b0add7fd53b3149e05fde60a4bebb56cf6c18b033f7a0fca1b377f2' 
  AND token = 'YYbvRfwx8kyPl1XR27FbPFljO7mAgVLOgJAH/jworAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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