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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c82a8a464b0cc6f5cd1e1636a7a2c0b1366e4501e4b390b00bf26d0a2da70d8c' 
  AND token = 'ltFVvClyVh70+BW4hePLIdvexqKVbWPynrU4yfRP5wk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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