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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '996ff8e9fa7f0daa6aa8e44a4f8528fbd0e59dc7854fb8d5bb66336444d87fc8' 
  AND token = 'P1Jr6CPVnAZSm0umgvwb0zq7pfEnLmpEoWGEZ6EItvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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