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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b2f04cfbbb9c4f7b8687f60a830eec7db8b44c036e7bb57054fbeaa72145c03' 
  AND token = 'IH2sU4BaxXbIc1gB12BUX6+b9uoXoOjCv38TZ5+DNE0=' 
  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"
    }
  }
}