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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08fdc1a982f83f5868d3764ea180b3fc9bee8929b9c7e1ffcc13f9a7f67789e7' 
  AND token = 'GsAPi4Q2e3JdYgsrkFmEmchv9KAg2UryYOoXWG+NeKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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