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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52199bf9e63ea25a68f808173df62d3c9a0c842bf9455d3060fd8153afbacafa' 
  AND token = '6a/AtyIpD3oLtB6o3zjPUw1LEbmsjmvqYlGnkl/CADw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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