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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89632e08345170ad3e93cc1d6cfd709ddeb278b912d1fa045b7dc8239a72edf3' 
  AND token = 'vy/BquH7hxn3ccCm/eR4OnOrKWc93Gj0+WpFn+m1clM=' 
  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"
    }
  }
}