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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e67b4dfa203b96b11f59997d88828827481e7f814c1fe918ed1449d90482c24' 
  AND token = 'qcBVQD4LZHL7fF6HaXdGuBd2v8DUwOUakniFKl3bhso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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