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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a828e9fa2acb16e912a9dc1d10fea1b927d832712100bfe8c98f8d783abb083c' 
  AND token = 'YG9A0E73JQ9J24sX2qCe8QBIvCefQqhQLX5KA72bB7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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