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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '849d34160d0d00694940c5af9d99c861fb759c3c241b01eb8915d089037b237a' 
  AND token = '7m+IIQ3mLEloo1acUCtyF55GUYKYXt4/RUE6UFcWt54=' 
  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"
    }
  }
}