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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85a62d5acb7093476e9a3dcac6bc60a9571e6799037ad54f5490a3e8715d30ed' 
  AND token = 'Cm9qwl6nfTLyERAb3c3C731aQxZaAM0Wl2CBn+c6hN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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