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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb0d2aabb07c2ac6929e8abe0137862c7fd43898f4401ab0bb4f18de54a8028b' 
  AND token = 'XRyfK4zKLcWJSF5kKYRc7VQ1X64967IJ129hUk+xgIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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