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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ac17ca21076c9aef8054a4c7f445b889d6b72aef499d160a083e8283f7e91e5' 
  AND token = '/3RWCXoOmyptRjbQAnlQl2YtxtpGG+Vvg4W5521QpOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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