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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82f890d88d08ffd57cf5d5c82527e3e86bf905cc0e8b683b67e22a3a2d33a8ef' 
  AND token = 'GEblr8c2LBVciyblyPkUhhX4EU5dI6ZI6imV/OFyYLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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