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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cef2afaf51106031c90478fd641f9aef33ff5e4286190bc446649cb8d05afea4' 
  AND token = 'ALZwIP/KJbb8Juc1UKLMlTEAtfMCxFQL8nZTynZuTbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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