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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38640b1549060960025402b200357fe7b8416092b591fce7ff6bb9807e3fae40' 
  AND token = '2uPdKRY3bM2QKyLE2g8n0tR3D2SH090ALoMWPG/hx2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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