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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da30c3fa1699d890ee548104f90940fb49f1bc53c2dd2c0c07d17cb8de01d1b3' 
  AND token = 'io5m8F91Mnh6kTYetgH0tGhlcj7EaiHVXtXlRB1P+hI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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