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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdcc374ca6e93dc9c64dcbf144896a38c58c9b5a62cf37d85c5235f625eabcf0' 
  AND token = 'UhEPg8NmQjdONh3UfEGoEUJhxKPG6+5i9/7TCflV7z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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