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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66229ef0bd55fd0a6ffa3b94360d9b807cfc324b7fda513346f8efde81acf487' 
  AND token = 'S7zT3VOtX7PaifXPG1fwtwEA9LRkg1rjK/cHEi/vmCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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