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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd652bbcadff34409026bc6adf1f86c6bed25ce6ba711a9d28f2dc435fd86cd7c' 
  AND token = 'bC57ipZ7Hy1TFbDnIrg5Uk/QMpiQa76g71udhzdF21A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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