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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0caa349c5a2ea0bb2f67ffd586b2b4d8b778cd89732193486b0d24fb7314af8' 
  AND token = 'dHYBiy2mZnnrN92C6LtW7Bh7ClmKugSyXVCLyFv2RkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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