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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb15cd26121c4981bb05260ff1592dc4e5bb3e053aac1f33d90f4432b4f683c3' 
  AND token = '/5I4JDuH7j5HvoOGZ3Hi/NlhtQi2U0hHH0pMWPtnXis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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