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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41d76dc405c79c9555974d424ea2eb26ffdfd2aadfc4e561558d3328074ff7ab' 
  AND token = 'yZO4q1OauG+hfFP7sSJLe2sDe48Kq3DxGjwIC5I/FiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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