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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e6c1492050bb309b8892aa3e24f48dfe2df7867d9d8ae5593e1e0f0bb6ca7b8' 
  AND token = 'vOZG0ekYObCyqy019KaoO1BXYSThheXzrC8jAWYQUFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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