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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6335b5a85cc9cc50d54abb80d1584a35add6265e261574cb34c383a8a219b9b3' 
  AND token = 'QoCl8YZ4lbE4fF5hIpuMYsIt9LczU3cY8W+OrVF9OIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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