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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '100dfe2ba38bf05d77ca71ef57373718fcae96fe35d4c3442a0b8157290b7992' 
  AND token = 'B9yt74JEF/88eQYGgaGDfD570ywkQ17o1y3ePo+TRwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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