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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59b0ad4e77747cd159228af994601676d7a8d5814efdf39e02ba6ef25a3c7825' 
  AND token = 'Ob2M68nOEiXQgf9eh9WaRdIYQ+iPzM5gZ6ettkjJBK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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