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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e22b94879ed6be2e9a44caa1c640d1cfeef27c7579d6930f7b22291a13557c55' 
  AND token = '4ibDxOq6cH1vNtqItqLD84hWyUWo18oWUJO4mqMi1Vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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