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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64316f61f8d76c650870b6175ee1d3818574dfe17c0ead38a354f9ba60c57c90' 
  AND token = 'X1brc/KOxTlo1t3K4z8GiuyuIhagmPxD3lcY4E3owZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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