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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae190ee1f4532f1a7d93f8fb2a30c586e4eb12d7e7830182dae59276f1a075c2' 
  AND token = 'xzcEEGmatPy858wGJnFDJe/ptg2ZyDjdKT9XniTLpcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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