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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ce375cd6d8aa92cb2ef75814753fa8227a67e24ed42ab6d491a90abb566f66b' 
  AND token = 'cnAPw00fR38BnfqZtye/HC7G5tHoBn6nhKz9ArxZsw0=' 
  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"
    }
  }
}