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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f9dcc2b04b1e7da3c9f40b13db793057a994f218c578ccb97e88b5591880e31' 
  AND token = 'iVtyJlHaW2FP8EnKXKisOZ7dME7O8LPrn85Pmx0gIHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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