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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79eb2d74d8c6c738932a02b0c997cb541a32399b29b0e2e1fcc6102ce55d8b9f' 
  AND token = 'ut4riYWnJ/bijyvCFy+XPJcAlt+WAiDIIJ1zmWeAN7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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